I'm probably the opposite of Dave in some ways. I was never held back, but while people always said I was "smart" I was far from a prodigy. I never skipped a grade, though I was never held back either but it came close a few times. I did the military and didn't go to college until I was 26. I also never programmed or did web development until I was closer to 30. I'm a huge failure in that regard, I'll never, ever be the top 5%.
That said, at least I can follow 5th grade English conventions.
I find that people who don't capitalize, especially their names, tend to lack confidence in themselves. So in a way the lack of capitalization actually makes a point.
The other reason may be that he sees capitalization as unnecessary as punctuation already performs the same task (akin to the JS semi colon debate.)
Personally, I find it a bit arrogant to ignore such a basic grammar rule, but it does not bother me so much as to not read it.
That said, at least I can follow 5th grade English conventions.